ETOPS773,
There's little point in learning how to use an RBI by rotating it's card, and the reason is simple. You're going to have to interpret what it is telling you when you're turning in the hold, flying base turns, procedure turns, missed approach turns, etc. In other words, you're going to need to be able to use it when turning to see if the turn is going according to plan. It would be impractical, if not impossible, to continually rotate the RBI card to match the DI whilst flying a turning aeroplane. Rotating the RBI card may seem the obvious answer in the early stages of your training but it will leave you short of the mark later. Hope this helps.
Regards, GT.